Heat pack



FIG. 1 is a front perspective view of a heat pack showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a left side view thereof;

FIG. 7 is a right side view thereof; and,

FIG. 8 is a back perspective view thereof.

The drawings are dotted in FIGS. 3 and 8 to show features of the heat pack having a contrasting material, surface texture, color, or any combination thereof as compared to other features of the heat pack. 

CLAIM The ornamental design for a heat pack, as shown and described. 